Alteration of an image seen through glass rather than in reflection from its surface.
GlassRenu · Educational illustration
Meaning and boundaries
Transmitted distortion can arise from thickness or flatness variation, multiple plies, interlayers, curved surfaces, heat treatment, assembly, or local material removal.
Why it matters in glass restoration
It matters where clear views, observation, display, vehicle, machine, or safety-critical sight lines must be preserved after restoration.
Related terms
References
- National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source - National Glass Association — Methods of Measuring Optical Distortion in Heat-Treated Flat Architectural Glass
Publisher’s original source - ASTM International — ASTM C1652/C1652M-21(2025): Measuring Optical Distortion Using Digital Photography of Grids
Publisher’s original source - National Glass Association — Glossary of Terms for Color and Appearance
Publisher’s original source